I am trying to incorporate the Aster DEM into my S1 GRD workflows, where I:
Apply Orbit File
TNR
Calibration to Gamma0
Lin to DB
RD Terrain Correction
It seems that no proper ortho-rectification takes place compared to the same workflow when using the SRTM 1 Sec DEM (see image, left processed with Aster, right with SRTM).
If I add the Terrain flattening, it puts out even no data when using ASTER (calibrating to beta0 before). While it is not a problem for areas covered by SRTM, it is for areas outside SRTM coverage.
I am using Snap 7 (latest relaease), on a Ubuntu 16.04 LTS with 8 CPUs and 32GB RAM.
Can you please investigate that?
Andreas, the ASTER dem does not auto download due to licensing. Have you downloaded the tiles and placed them in the auxdata dem folder. Where did you get the tiles from? What do the file naming and file structure look like? It’s possible you have a newer DEM distribution where the file naming has changed?
I did not know that ASTER does not auto download. In fact, my aim is to automate as much as possible.
What would be a good alternative for arctic regions having automisation in mind?